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MODE
61202300L1-1
Mode sets the type of 2-wire to T1 signalling and supervi-
sion to be used. Choices include:
FXS_LS
This mode sets the port to use FXS loop-start signalling
on the T-Span and loop-start supervision on the analog 2-
wire interface.
It also supports far-end disconnect by removing tip-
ground during the call if signalled to do so over the T-
Span. When used with an ADTRAN FXO+, this feature
allows line-current dropouts to be passed on to equip-
ment connected to the FXS+ 2-wire port.
Line Side Answer Supervision (LSAS) reverses Tip and
Ring polarity when a call originated from the FXS+ is
answered. To use this feature, ANSWER S'VSN must be
enabled and the port must receive Reverse Loop Current
Feed (RLCF) signalling on the T-span. Ringing cadence
will follow that provided over the T-Span or detected by
the FXO port at the far-end.
FXS_GS
This mode sets the port to use FXS ground start supervi-
sion on the analog 2-wire interface. Ground start opera-
tion is often used with trunk interfaces to PBS and key
systems to prevent glare conditions. Ringing cadence
will follow that provided over the T-Span or detected by
the FXO port at the far-end. Line Side Answer Supervi-
sion is also supported.
TANDEM_LS
This mode sets the port to use E&M signalling on the T-
Span and loop-start supervision or on the analog 2-wire
interface. When using this mode, line-current dropout
for 500 ms is provided when a call terminates and the far-
end hangs up.
This may be useful for voice-mail or modem systems that
need far-end disconnect supervision. This mode also
FXS+ Quad Voice Option Module User Manual
Chapter 3. Operation
3-7
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